Built-up bobbin



Patented Dec. 17, 1940 UNITED STATES 2,225,591 BUILT-UP BOBBIN Lavern J. Jordan, Fairview Village,

to Industrial Rayon Ohio, assignor Corporation, Cleveland,-

Ohio, a corporation of Delaware Application January 20, 1939, Serial No. 252,001

3 Claims.

The present invention provides a built-up bobbin which can be manufactured at very low cost, which is extremely rigid, and which, while light in weight, is very durable. Among other things,

the invention provides a bobbin of this type which may be handled without damaging the material wound thereon. The, parts of the bobbin which come into contact with the thread are preferably of non-metallic material such as hard rubber, Bakelite, or other synthetic resin, while the parts which serve to hold the bobbin together are preferably of metal. The latter parts are so arranged as to provide one or more bearing surfaces within the bobbin. For convenience, but in no sense of limitation, the invention will be described as applied to a bobbin particularly adapted for use in cap-twisting apparatus.

In the accompanying drawing, in which like reference characters refer to like parts throughout, Figure 1 is a side elevation, partly in section,

' of cap-twisting apparatus in which is employed a bobbin embodying the features of the instant invention. Figure 2 represents. on an enlarged scale, a side elevation of the bobbin as seen-from line 2-2 of Figures 3 and 4. Figure 3 is a plan of the bobbin. Figure 4 is a bottom view of the bobbin. Figure 5 is a sectional elevation of the bobbin as seen from lines 55 of Figures 3 and 4.

In Figure 1, a portion of the paratus is shown in side "elevation, but it will be. understood that a number of similar captwisting units are disposed side by side along the operating face of the apparatus. In each of said units, thread I, supplied from a suitable source, passes through guide 2 to bobbin 3, employed in and in efl'ect forming part of the captwister indicated generally at 4. The guide 2 is mounted on shield 5, one of which is disposed be- 40 tween each pair of adjacent cap-twisting units to prevent entangling of adjacent "balloons formed by thread I. As many as fifty, or even more, suchthreads may proceed to their respective bobbins and be twisted simultaneously on one side of the same machine.

The illustrated cap-twisting apparatus operates in the usual manner, that is. the bobbin 3, while being rotated, is reciprocated into and out of the cap 3, such bobbin 3 being shown in its lowermost 50 position in Figure 1.

the bottom edge of cap 6 serves to guide thread I as it is wound on bobbin 3. The cap 3 for each cap-twisting unit is mounted in a stationary position at the upper end of a spindle l which extends axially through the bob- In operation,

cap-twisting apbin 3 and the bobbin-supporting whorl 3. Spindle '1 is non-rotatably mounted on fixed rail 3 which extends lengthwise of the machine as a whole supporting the spindles for a plurality of adjacent cap-twisters. Fixed rail 9 is rigidly 5 attached to member II which forms part of the frame of the machine.

Bobbin-supporting whorl. 8 for each captwister is mounted for rotation on vertically reciprocable lifter rail l2 which, like fixed rail 9, 10 extends lengthwise of the machine as a whole. Members I3, of which at least two are provided, are fixed to lifter rail l2, as well as to rail it upon which is mounted belt guide pulley l5. Each of rail 9 and bracket l1. Whorl 8 is rotated at a high speed by belt i8 driven by suitable means (not shown). Bobbin 3 is mounted on whorl 8, driving engagement therebetween being secured 20 by suitable means as by pins on whorl 8 which project into recesses in the base of bobbin 3.

Vertical reciprocation of bobbin 3 is effected by lever. arm l9 actuated by a suitable cam mechanism. Achain 2| is connected at its one 25 end to the end of lever arm l9 and at its other end to a sprocket on shaft 22, which is rotatably mounted on the frame of the machine by means of spaced brackets 23. Up-and-down movement of the end of leverarm l9 therefore causes the 80 shaft 22 to rotate about its axis, first in one direction and then in the other. Chains 24 connected to members i3 and sprockets 25 fixed to and spaced lengthwise of the shaft 22 cause the lifting rail l2 and associated mechanism to reciprocate 85 vertically.

Bobbin 3, shown in detail in Figures 2 to 5, inclusive, comprises a central tube 21, a hollow cylindrical body portion 28 surrounding said tube 21, and heads 29 and 30 at each end of said body portion. The tube 21, which serves to clamp the assembly together, is of metal, preferably steel. The metal of which tube 21 is constructed should be sufliciently malleable to permit the ends thereof to be flanged over heads 23 and 30, as shown in Figures 3, 4 and 5, but not so malleable as to permit'the flanged portions of the tube to have an undue amount of flexibility.

It is desirable that, as shown, the tube 2'! be of reduced diameter at its ends, so that the porso tions 32 and 33 of the tube may constitute bearing surfaces. For-this purpose, the diameter of the tube may be reduced at its ends from an original diameter equal to that of the intermediate portion; alternatively, the intermediate. portion of the'tube may be expanded from an original diameter equal to that of the ends. In any event, it is desirable that portions 32 and 33 be machined to accurate internal size to fit the bolster of the 5 cap-twisting apparatus. As shown in Figure 5, thelength of portion 32 of tube 21 is preferably greater than that of portion 33.

A hollow cylindrical body portion 28, constituting the barrel of the bobbin, surrounds tube 21,

but, as shown in Figure 5,, is considerably shorter than said tube.

Upper head 29 fits over the upper end of cylindrical body portion 28, being provided with a recess 34 in which the upper end of body portion 5 28 fits closely. Lower head 38 is provided with a similar recess 35 in which is received the lower end of body portion 28. A lug 36 is formed in the circular recess of each head, said lug fitting in a notch 31 in the end of cylindrical body portion 28.

Lugs 36 and notches 31 cooperate to prevent relative rotation between body portion 28 and heads 29 and 30.

Upper head 29 is provided with a central bore 38 of such dimensions as to provide a snug flt for 2 the end portion 32 of tube 21, while lower head 39 is provided with a central bore 39 closely fitting the end portion 33 of tube 21. Each of said heads is preferably provided on its outer face with a recess 4l which may as shown be comparatively shallow but is of larger diameter than the central bore in said head. The flanges 42 at the ends of the tube 21, by means of which the tube 21 clamps the heads 29 and 30 against body portion 28, are disposed in said recesses 4|, as a result of which the ends of the tube 21 do not extend beyond the faces of the heads 29 and 30. The bottom of each .of the recesses M is preferably tapered as shown in Figure 5 to aid in clamping the heads 29 and 30 together.

Upper head 29 preferably includes the handle 43 by means of which the bobbin may be grasped by the operator. The lower portion of head 29 is in the form of a tapered flange 44 having a smooth polished edge 45 over which thread may 5 slide without being snagged or broken in passing to or from the bobbin. Lower head 30 is larger in diameter than body portion 28 in order to permit the thread to be wound on. body portion 28 between the flange thus formed and the flange 44 on upper head 29. If desired, a reinforcing portion 46 may be provided on the inside of lower head 38.

In the embodiment of the invention shown, two recesses 41 are provided in head 30 on opposite sides of central bore 39 which recesses are adapted to engage suitable pins on the whorl on which the bobbin is mounted. Other means providing the necessary driving engagement can, of course, be employed in lieu thereof. The periphery. of

head 30 is also provided with two slots 48 in which the thread may be engaged in starting the operation of winding the thread on the bobbin. One slot is adapted to engage the thread in case the rotation of the bobbin is to be clockwise, while 5 the other is adapted to engage the thread in case of counterclockwise rotation.

In the preferred construction of the bobbin, the parts which come into contact with the thread; i. e., body portion 28 and heads 29 and 70 30, are made of suitable non-metallic materials, while the tube 21 ls-of metal. The non-metallic parts can advantageously be made of hard rubber, Bakelite, or other suitable synthetic resin. The heads 29 and 30 are preferably molded, while 75 the body portion 28 may be molded or, if desired, out from seamless tubing of such material. Because of the stresses induced in body portion 28 in the thread winding operation, it is desirable that it be of reinforced material; e. g. Bakeliteimpregnated fabric or the like. 5

Thus the parts which come into contact with the thread are made of materials which may be made' with very hard, smooth surfaces. Since there is no grain structure, the edge of the upper flange, which is in frequent contact with the 10 thread, cannot split and snag the thread, a failing common in wooden bobbins. Such materials, moreover, do not absorb moisture to such an extent as to cause swelling or warping of the bobbin. Furthermore, the surfaces of the bobbin 15 may be cleaned easily when made of such materials.

In the present invention, such features are combined with the additional advantage that such a bobbin may, because of the type of con- 20 struction employed, be light in weight and yet extremely strong. It is unusuallyrigid due to the fact that the non-metallic parts are held in compression, under which stress their strength is greatest, while the part which holds the device 25 together and hence is under tension is metal capable of withstanding high tensile stress. Yet the metal does not contact the thread at any point as a result of which feature it cannot damage the thread should it become corroded. In 30 case it is desired to replace one or more parts of such a bobbin, the bobbin may be readily disassembled and reassembled with such new parts. Such bobbins can be built at very low cost because of their extremely simple construction. 35

It is intended that the patent shall cover, by suitable expression in the appended claims, whatever features of patentable novelty reside in the invention.

What is claimed'ls: 1

l. A built-up bobbin comprising a hollow, seamless body portion of substantially circular cross section formed of non-metallic material; a unitary handle-shaped head of non-metallic material having a recess in its inner face in which recess one end of said body portion flts closely; a second unitary head of non-metallic material having a recess in its inner face in which recess the other end of said body portion fits closely; means associated-with said second head provid- 50 ing driving engagement with means for rotating said bobbin; means associated with the recesses in the inner faces of said heads for preventing relative rotation between said body portion and said heads; and a seamless, unitary metal sleeve passing axially through said body portion and heads, said metal sleeve being flanged into recesses formed in the external faces of said heads to hold said metal sleeve under tension and said heads and body portion under compression. 60

2. A built-up bobbin comprising a hollow, seamless cylindrical body portion; a unitary handle-shaped head having a recess in its outer face and, in its inner face, a recess inwhichone end of said body portion fits closely; a second unitary head having a recess in its inner face in which the other end of said body portion fits closely and, in its outer face, one or more recesses adapted to receive means for rotating said bobbin; a seamless, unitary metal sleeve expanded intermediate its ends passing axially through said body portion and heads, the ends of said sleeve being flanged over in said recesses in the outer faces of said heads to hold said metal sleeve under tension and said heads and body portion unand means adapted to prevent between said heads and said recess one end of said body portion fits closely;-

a second unitary head of non-metallic material having a recess in its outer iaceand a recess in its inner face in which latter recess the other 3 end of said body portion tits-closely; means associated with said second head providing driving engagement with means i'or rotating said bobbin: and a seamless metal sleeve passing axially through said body portion and heads, one end of 5 said sleeve being flared over the outer suriace oi. said handle-shaped head and the other end of said sleeve being flanged into the recess in the outer face or said second head in such manner as to hold said sleeve under tension and said 10 heads and body portion under compression.

- LAVERN J. JORDAN; 

